Here for reference is Wu's official documentation on how to initialize the DCC2 with steps numbered for convenient reference:

Standard initialization procedure:

   operation                               comments
1. write 0xffff0000 to 0x4                 clear configuration register
2. write n          to 0x8                 set up monitoring event scale factor to n+1
3. write 0x?????    to 0xc                 set up HTR enable register
4. write I2C_ID     to 0x10                set up I2C ID register
5. write 0x4	    to 0x0		   reset TTCrx
6. set up configuration register, but do not put into run mode
7. write 0x3        to 0x0                 reset all registers and slink
8. write 0x3        to 0x4                 set to run mode and enable slink
9. write 0xb        to 0x0                 reset all registers and slink after run started

This stuff is spread all over the DCC code, but as a crude first step we could just do steps 7, 8, 9 in a warmInit().

To do it properly requires duplicating significant code, first from hcalDCCManager::connect()

-- EricHazen - 22-Apr-2010